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MSMA-Induced Straighthead in Rice (Oryza sativa) and Effect upon Metabolism and Yield

Published online by Cambridge University Press:  12 June 2017

Diana K. Horton ,
Robert E. Frans  and
Tom Cothren
Diana K. Horton
Affiliation:
Agron. Dep., Altheimer Lab., Univ. of Arkansas, Fayetteville. AR 72701
Robert E. Frans
Affiliation:
Agron. Dep., Altheimer Lab., Univ. of Arkansas, Fayetteville. AR 72701
Tom Cothren
Affiliation:
Agron. Dep., Altheimer Lab., Univ. of Arkansas, Fayetteville. AR 72701
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Abstract

The effects of MSMA on the development of straighthead, yields of rice, and hormonal balance in rice plants were observed in a greenhouse study. MSMA was applied to soil at 0, 6, and 9 kg ai/ha. At 6 kg/ha some straighthead and a 45% yield reduction occurred. At 9 kg/ha straighthead was evident, and yield was reduced by 85%. Analyses were made for ethylene with gas chromatography and for indoleacetic acid (IAA) with high performance liquid chromatography. Concentrations of ethylene and total arsenic detected in the tissue from rice leaves grown in MSMA-treated soil were higher at every growth stage when compared to plants grown in untreated soil. Both treated and untreated plants showed marked increases of these compounds during the reproductive stage and a decrease prior to panicle emergence. Significant changes occurred in IAA levels with the growth stage of treated and untreated samples, but MSMA had no obvious effect on IAA levels at any of the stages examined in this study.

Keywords

Indoleacetic acidethyleneplant hormonesstage of growthmonosodium methanearsonate
Type
Research Article
Information
Weed Science , Volume 31 , Issue 5 , September 1983 , pp. 648 - 651
Copyright
Copyright © 1983 Weed Science Society of America 

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References

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